Improvement in chisel for cutting gains



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HIRAM '-BLGELOW,

SKOWHEGAN, MA IN E.

Letters Patent N 100,310, (lated August 16, 1870.

IMPROVEMENT IN CHISEL FOR CUTTING- GAINS.

The Schedule referred to in these Letters Patent and making part of the same To all whom it may concern.-

Be it known that I, HIRAM Brennow, of Skowhegan, in the county ot' Somerset and State oi' Maine,l

have invented `a new and useful Improvementin a Gain Chisel; and' 'do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being hazl to the accompanying drawing, forming part oi' this specifica-tion.

The object of this 'invention is vto provide a tool i'or iicilitating the operation oi'lettin'g butt hinges into windowblinds, shutters, doors, trunks, and for all purposes for which butt hinges are used when they are let into the wood; vand lhe invention consists in combining adjustable gauges, and an adjustable spar, with one or more 'chisels, by means ot' which gains may be cnt inthe wood for receiving the butt, as will be hereinafter.

more fully described.

In the accompanyinr drawing- Figure lprepresents a face yiew of the tool, showing` the adjustable gauge on thei'ace of the chisel.

Figure 2 is an edge view of `the same, showing the gauge at right angles with the face of the chisel.

'Similar letters of reference indicate corresponding part-s. 4

ln this example oi' my invent-ion, I show two chisels fixed stationary to a lhandle or stock with a gauge turningon pivots,.and operating in connection with one of the chisels to govern the cut thereof in depth and thickness. But l do not confine myself to the use oi' the second chisel, and when I do use it I may Vdecide to make it adjustable, so that the tool may be used for butts Oi' diierent widths. Instead of 'pivoting the gauge t0 the stock, I may decide to connect it with the chisel in some other 'way,f1)ut so that it will produce thcvsame or asimilar result.

A represents the handle having a square stock, B, to which the chisels are fastened on opposite sides, as seen in the drawing.

C is the chisel, which operates more directly in connection with the gauge.

D is the opposite orsecond chiseL Eis the hinged or pivoted gauge, which consists of two arms, fand g, connected together by the gauge H, which is made adjustable on the arms fg by means ot screws and slots, as seen at I I, fic. 1.

J is an adjustable plate `with a spur, 7c, in its end.

iVhen the gauge E is turned back at right angles with the stock B it governs the reach of the spur on to the stile oi' the-blind.

When the gauge Eis turned down parallel/with the face of the chisel, as seen in iig.' l, the adjustable gauge H governs the cut of the chisel as regards the reach oi' the gain on to the stile.

A s seen in dotted lines in iig. 2, the arms E drop back past the edge of they chisel, the space between them representing the thickness ot' but-t nr depth of the gain. As the tool is forced down this thickness is cut ont, and the ain is complete and ready for the butt.

In using the tool, the iirstoperation is to place the arms (or gauge E) at right angles with the steek, and

mark with the spur the reach of the gain on 'to the stile. 4The chisel edges are then placed so that their corners intersectthe line thus made; A- slight" -blowY with a mallet on the end oi' the'handle will drive the chisels to the proper depth. 1 turncddown, as seen in dotted lines, and the chisel C is placed in position between the two cross-cuts thus made, and forced down, the gauge E governing the thickness of cnt, and the gauge H the reach, which which will be the vmark made bythe spurt.

L is a spring,T on each side of the stock, which acts against the ends of' the arms f g to hold them in place.

N represent-s a` stop-pin on each side, so placed as to keep the arms at right angles with the stock when the spur is used.

it will be seen that the gauges are used on a single chisel, and that the second chisel may be dispensed with, or made adj estable, as before' mentioned.

Having thus described my invention, v

I claim as new and desire to secure by Letters Patent.-

1. Iihe gauge E, (or arms fg,) gauge H, and spur 7.', or their equivalents, in combination with a chisel,

when 'arranged to operate substazitiall y as and for the purposes described.

2. The combination with the stock and handle'A B,of the chiselsfO and D, gauges E and H, andspnrplate J, `substantially asand forthe purposes herein shown and described.

HIRAM BIGELOW. Witnesses:

STEPHEN GOLMAN,

C. D. MILLER.

The gauge E is then l 

